Grinding machinery



July 14, 1931.

c. BOOTH 1,814,363

GRINDING MACHINERY 7 Filed May 9, 1928 4 Sheets-Sheet 1 CLEMENT BO0TH,

July 14, 1931, c. BOOTH GRINDING MACHINERY Filed May 9, 1928 4Sheets-Sheet 2 gnuew'roz CL EME/VT Boar/1,

July 14, 1931. BOOTH 1,814,363

GRINDING MACHINERY Filed Ma 9, 192 4 Sheets-Sheet 5 \9 gvvue'n forCLEMENT Boar/ 6km we 1 July 14, 1931.

C. BOOTH GRINDING MACHINERY Filed May 9, 1

4 Sheets-Sheet 4 Patented July 14, 1931 UNITED STATES PATENT OFICECLEMENT BOOTH, OF CINCINNATI, OHIO, ASSIGNOR. TO THE CINCINNATIGRINDERS, INCORPORATED, 015 CINCINNATI, OHIO, A CORPORATION OF OHIOGRINDING MACHINERY Application filed May 9, 1928. Serial No. 276,480.

This invention relates to improvements in grlnding machinery and moreparticularly to that class of grinding machinery which has become knownas centerless grinders.

In centerless grinding there are two methods ge erally employed, onemethod, known as the thru" feed method wherein the work is fed axiallythrough the grinding throat,

and the other method, the one to which this application relaies,comprises introducing work pieces into the grinding throat laterally oraxially thereof and removing them in substantially the same way. lhismethod lends itself to the grinding of tapered and other formed work andrequires a formed regulating or grinding wheel or a particulararrangement of them. One of the disadvantages of grinding tapered andother formed work pieces, such as shouldered work and the like, is thetime lost in introducing the work pieces into the grinding throat andremoving them therefrom.

An object of this invention is to provide a device wherein the taperedand other formed work pieces may be automatically introduced into thegrinding throat and automatically ejected or removed from the saidgrinding throat.

Another objectof this invention is to provide a device for automaticallyplacing in and removing from the grinding throat a plurality of workpieces at one time together with mechanism for completely finishing aplurality of work pieces.

To accomplish these objects the invention in its broadest aspectcomprises a feed member for successively introducing work pieces intothe grinding throat and ejecting means for removing the said workpieces.

In a more specific aspect the invention comprises a hopper for holdingand delivering successively individual work pieces, a reciprocatingmember for receiving the work pieces from the hopper and a synchronizedmeans for placing the work pieces into and displacing them from thegrinding throat.

Further features of novelty in the construction and the advantagesattendant thereon should be apparent by reference to the followingspecification taken in connection with the accompanying drawings,forming a part thereof, and it will be understood that I may make anymodifications in the specific details of construction or combination andarrangement of parts hereinafter disclosed within the scope of theappended claims without departing from or exceeding the spirit of theinvention.

Fig. 1 is a front elevation of a centerless grinder embodying thereinthe features of this invention.

Fig. 2 is a fragmentary top plan view of the device shown in Fig. 1,partly shown in cross section.

Fig. 3 is a perspective view of a tapered roll adapted to be finished orground by this invention.

Fig. lis a fragmentary enlarged sectional View taken on line 4-4 of Fig.2.

Fig. 5 is a fragmentary enlarged sectional view taken on line 5-5 ofFig. 4.'

Fig. 6 is a fragmentary enlarged sectional view taken on line 66 of Fig.5.

Fig. 7 is an enlarged fragmentary sectional view taken on line 6-6 ofFig. 6.

Fig. 8 is an enlarged fragmentary sectional view taken on line 88 ofFig. 2.

Fig. 9 is a view similar to Fig. 8 showing the cam in a second positionfrom that shown in Fig. 8.

Fig. 10 is a fragmentary enlarged sectional view taken on line 1010 ofFig. 8.

Fig. 11 is a fragmentary enlarged section al View taken on line 11-11 ofFig. 10.

Fig. 12 is an enlarged sectional view taken on line 12-12 of Fig. 11.

In the drawings in which similar oharacters of reference are employed todenote corresponding parts throughout the several views, the numeral 15designates the bed having mounted on'it, in opposition, a pair of slides16 and 17 which rotatably support a-grinding wheel 18 and a regulatingwheel 19 respectively. Conventional mechanisms, such as hand wheels 20and screws 21, may be employed for actuating the grinding and regulatingwheels toward and away from one another to provide a grinding throat 22between the said grinding and regulating wheels.

The slide 17, is provided with an end member 23 upon which blocks 24 aremounted which are connected together by a cross bar 25. Intermediate theblocks 24 there is provided a housing 26 which encloses a cam plate 27.The cam plate 27 has secured to its one end a tongue 28 which extendsbeyond the housing 26 and is pivotally connected to a link 29. The link29 has formed at one end an elongated perforation 30 in which the pivot31, carried by the tongue 28 is received. The link 29 is pivoted at 32intermediate its ends and carries at its free end a roller 33 which isreceived in a cam groove 34 formed in cam drum 35 secured to the shaft36 upon which the regulating wheel 19 is mounted. From the foregoing itwill be noted that the cam plate 27 and tongue 28 are reciprocated bythe link 29 through the cam groove 34 formed in the cam drum 35.

The cam plate 27 has formed on it three distinct cams 37, 38 and 39which contact rollers 40, 41 and 42 respectively. The cam plate 27 isguided by means of a slot 43 formed in the base 44 of the housing 26 aswell as by a forked guide member 45 secured in the cover 46 of thehousing 26.

The rollers 40 and 41 are rotatably mounted in the forked ends of posts47 and 48 respectively.

These posts 47 and 48 are received in and reciprocated through suitablesleeves 49 which extend through perforations formed in the cam platehousing 26. The upper ends of the posts 47 and 48 are bifurcated andreceive the opposite ends of a work rest blade 50 As the cam plate 27 isreciprocated through its housing the posts 47 and 48 are raised andlowered through the agency of cam faces 37 and 38 and their associatedrollers 40 and 41. The work rest blade 50 is also raised and loweredfrom the position .shown in Fig. 8, where it is within the grindingthroat, to the position shown in Fig. 9 where it receives the rough orunfinished work pieces from a hopper and in which position the finishedworkpieces are discharged from the work rest blade.

The cam plate housing 26 has extending from it a pair of standards 51 towhich is secured a cross frame member 52 which carries a hopper 53having passages 54, 55 and 56 therein. It will be noted that thepassages are curved so that they can be easily fed from the front anddeliver the work pieces to be ground to the proper position. The

hopper 53 is provided at its base with a shaft arms 59 on the star orGeneva Wheel 58 pass through slots or openings 66 formed in a dependinglug 67 which prevent the finished work from being carried through acircle and back into the hopper and again fed into the grinding throat.The shaft 57 is provided at its outer end with a ratchet 60 with theteeth of which a pawl 61 is in engagement. The pawl 61 is carried by anarm 62 which in turn is secured to a reciprocating member 63 to whichthe roller 42 is secured. The reciprocating member 63 is received in andguided by a bearing member 64 secured to and carried by the cover 46 ofthe cam plate housing 26. The

arm 62 is adapted to. be elevated by the cam face 39 coming intoengagement with the roller 42 and raising same.

It should be noted that the work rest blade has been raised to itsuppermost limit (see Fig. 9), before the cam face engages the roller 42to elevate th m 62. It will also be noted that there is a dwell in themovement of the work rest blade 50 while the arm 62 is being raised. Itis during this dwell that the work pieces which have been finished andare carried by the work rest blade are discharged therefrom and newpieces deposited upon the work rest. The finished work pieces aredischarged from the work rest blade 50 by the arms 59 into a suitablechute 65 by which they may be directed or delivered to a Work receivingdevice. L

The work rest blade 50 is also provided with recesses 68 correspondingin size and position to the discharge ends of the passages 54, 55 and 56into which the workpieces 69 are deposited. These recesses are providedwith dividing lugs 70 having stop screws or positioning screws 71 forterminally engaging the work pieces before they are inserted in thegrinding throat. Each of the divid- (See Figs. 11 and 12.)

ing lugs 70 is split, as shown at 72in Fig. 7,

drawings, is formed to control three rolls or work pieces 69simultaneously. It will be noted that the rolls 69 are tapered and inorder to grind a taper the grinding or regulating wheel must be taperedcorrespondingly. In this instance the grinding wheel is formed having aplane face while the regulating wheel has three concentric flanges 74,75 and 76 thereon, each having a face double the taper to be formed onthe work piece. The flanges 7 4, 75 and 76 have suitable recesses orgrooves 77 between them.

The grinding wheel 18 is approximately twice the width necessary forgrinding the three work pieces simultaneously. This has been provided sothat the grinding wheel 18 may be reciprocated longitudinally of thework pieces to eliminate the necessity of constantly trueing orredressing the grinding wheel. An acceptable mechanism forreciprocatingthe grinding wheel may be embodied herein and as thereciprocating mechanism forms no part of this invention it is deemedunnecessary to illustrate it.

The operation of the device is as follows:

Suitable mechanism is provided for rotating the grinding wheel 18 at arapid or grinding rate of speed in the direction in dicated thereon bythe associated arrow. Other mechanisms may be provided for rotating theregulating wheel 19 at a much slower or work rotating rate in the samedirection that the grinding wheel is rotated. By rotating the grindingand regulating wheels in the same direction their opposed peripheriestravel in the opposite directions with respect to the work rest blademounted between the said grinding and regulating wheels. The width ofthe grinding throat between the wheels may be varied by manipulating thehand wheels and screws associated-with the grinding and regulating wheelslides.

A plurality of work pieces are placed in the passages 54, 55 and 56through the inlet openings 78. These openings 78 are tapered so that thework pieces may be inserted in but one way so that the large end of thework pieces is toward the rear of the machine. As the regulating wheelshaft is rotated and the drum thereon oscillates the link 29 about itspivot the tongue 28 is reciprocated laterally of the grinding throat.This reciprocation of the tongue and its associated cam plate causes therollers 40 and 4:1 to be raised by the cam faces 37 and 38 for raisingthe posts 47 and 48 and the work rest blade 50 secured thereto. A slightdwell is caused in the movement of the work rest blade after the rollers40 and 41 have reached the upper end of the cam faces 37 and 38.Continued movement of the cam plate 27, as seen in Fig. 9, causes thecam face 39 to contact the roller 42 for raising the arm 62 andassociated mechanism and rotating the shaft 57 and star or Geneva wheelsecured to the said shaft. This movement or rotation of the star orGeneva wheel 58 occurs, as stated above, during the dwell in themovement of the workrest blade 50 and it is during this dwell that thefinished work pieces are discharged from the work rest blade and new orunfinished r pieces deposited thereon. The finished work pieces aredeposited in the chute 65 by which they may be conveyed to a suitablecontainer or holder. I

The cam plate 27 is now shifted to the right as seen in Fig. 9 whereuponthe: work rest blade is lowered to place the unfinished or rough pieceswithin the grinding throat in operative position to the grinding wheel.A slight dwell is now caused so that the work pieces 69 may be properlyfinished. This dwell may either be caused by the cam formed in the camdrum or by permitting the continued movement of the cam plate 27 so thatthe rollers 40 and 41 ride upon the flat places 80 at the base of thecam faces 37 and 38 and causing no movement of the work rest blade.

While this invention has been described rather minutely with regard tothe embodiment shown in the accompanying drawings it should beunderstood that numerous modificatio'ns may be made all within the scopeof this invention and the claims appended hereto.

What is claimed is:

1. A centerless grinder including opposed grinding and regulating wheelsforming a work receiving throat therebetween, a work rest blade disposedwithin the throat, means for reciprocating the work rest bladevertically through the throat, and a hopper for depositing work pieceson the work rest when the said work rest is at its movement.

2. A centerless grinder comprising a pair of opposed grinding andregulating wheels forming a grinding throat between them, a work restwithin the grinding throat and adapted to be reciprocated verticallythrough the grinding throat, a cam plate positioned upper limit of ibeneath the work rest and adapted to be reciprocated longitudinallyofthe work rest, cam faces on the cam plate, depending posts carried bythe work rest cooperating with the cam faces for raising and loweringthe work rest, a hopper disposed above the grinding throat, andsynchronized means for discharging the work pieces from the hopper on tothe work rest when the said work rest is at the upper limit of travel. I

3. In a centerless grinder the combination with a pair of opposedgrinding and regulating wheels forming a grinding throat between them,of a work rest adapted to be vertically reciprocated through thegrinding throat, a hopper above the grinding throat adapted to hold anddischarge work pieces wheels having a grinding throat between them, avertically movable work rest within the grinding throat, and means fordischarging work pieces on to the work rest when it is in its upper mostposition.

5. In a centerless grinder the combination of a pair of opposed grindingand regulating wheels, a vertically movable Work rest blade having postsdepending therefrom, a cam plate below the work rest blade and movablelongitudinally of the work rest blade having rest blade, a closure meansat the base of the hopper including a shaft, and means forintermittently rotating the shaft for operating the hopper closure meansfor discharging work pieces from the hopper.

6. In a device of the class described the combination of a pair ofopposed grinding.

and regulating wheels forming a gr nding throat between them, means forvarying the grinding throat, a work rest blade within the throat adaptedto be vertically reciprocated through the throat and means for placingwork pieces upon the work rest blade when it is atits upper most limitof movement.

7. A centerless grinder including opposed grinding and regulating wheelsforming a work receiving throat between them, a shaft associated withthe regulating wheel, a work rest blade reciprocatable verticallythrough the grinding throat, means movable laterally of the grindingthroat for vertically reciproeating the work rest blade, a tongueextendmg from the laterally reciprocating means, and a cam carried bythe regulating wheel shaft for actuating the torque and associatedlaterally reciprocating means.

8. In a device of the class described the combination of a pair ofopposed grinding and regulating wheels forming a grinding throat,between them, a work rest blade adapted to be vertically reciprocatedthrough the grinding throat, means disposed above the throat forsuccessively ejecting finished work \pieces from and placing unfinished.work pieces on the work rest blade when it is in its upper mostposition.

9. In a device of the class described the combination with a pair ofopposed grinding andregulating wheels forming a throat between them, ofa work rest blade within the throat adapted to support a work piecevingrinding position, a pair of posts secured to and depending fromtheblade, rollers carried by the posts at their lower ends, a re-qciprocating cam engaging the rollers and adapted to raise and lower theposts for raising and lowering the work rest'blade for lacing workpieces in and removing them rom thgrinding throat, and means forreciprocating the cam.

10. In a device of the class described the combination of a air-ofopposed grinding and regulating wheels forming a grinding throat betweenthem, aframe above the grinding throat, a hopper carried by the frame, arotatable closure member havin a shaft at the base of the hopper, a rateet .mechanism on the; end of the shaft, a work rest blade within thegrindin throat for supporting work pieces in grin 'ng position,

4 wheels having a hopper closure member for intermittently dischargingwork pieces from the hopper onto the work rest blade.

11. In a centerless grinder the combination of a pair of opposedgrinding and regulating wheels having a grinding throat between them, avertically reciprocable work rest blade within the grinding throat,means for moving the work rest blade, and means for discharging the workpieces from the work rest blade when it is at its uppermost limit ofmovement.

12. In a centerless grinder the combination of a pair of opposedgrinding and regulatingwheels having a throat between them, a work restblade adapted to be vertically reciprocally reciprocating the work restblade,

with the last mentioned means for discharging work pieces from the saidlast mentioned means onto the work rest blade. 13. In a centerlessgrinder the combination of a pairbf opposed grinding and regulatingrinding throat between them, a work rest blade adapted to be verticallyreciprocated through the grinding cated through the throat, means forvertithroat, a hopper having passages therein inounted above thegrinding throat and adapted to hold work pieces, means at the base ofthepassages in the hopper for closing saidpassages, said means including arotatable shaft, a fixed member having arms extending at right angles toone another and secured to the rotatable shaft for closing the passagesof the hopper and for discharging finished work pieces from the work.rest blade, and synchronized means for raising and lowering the workrest blade and rotating the shaft for successively displacing thefinished work pieces from the work rest blade and for dischargingunfinished work ieces from the hopper passages onto the wor rest blade.

14. A centerless gr der includinfg opposed grinding and regulatingwheels ormmg a grinding throat between them, a work rest blade adaptedto be vertically reciprocated through the grindin throat, a hopper abovethe grinding throat aving assages formed therein for holding andelivering work pieces to the grinding throat, and means at the base ofthe hopper for preventing inadve'rten't discharge of the work piecesfrom the hopper, said means being adapted to be mtermittently rotatedfor discharging the work pieces from the hopper.

15. In a centerless grinder the combination-of a pair of opposedgrinding and regulating wheels forming: work grinding throat betweenthem, a wor be vertically reciprocated through the grinding throat, ahopper above the grinding rest bladeadapted to throat adapted todischarge work pieces on to the work rest blade when it is in its uppermost position, means including a rotatable shaft having arms extendingtherefrom for retaining the work pieces within the hopper and preventinginadvertent discharge thereof, means for rotating the shaft and arms fordischarging unfinished work pieces from the hopper on to the work restblade and for displacing finished work pieces from the work rest blade,and means for preventing the return of the finished work pieces to thehopper.

16. In a centerless grinder the combination of a pair of opposedgrinding and regulating wheels forming a grinding throat be tween them,a work rest blade adapted to be vertically reciprocated through thegrinding throat, means for holding work pieces above the grindingthroat, means associated with the holding means for regulating thedischarge of the work pieces from the holding means including arotatable shaft having arms extending therefrom, the arms being adaptedto discharge the work pieces from the holding means on to thework restblade and for displacing the finished work pieces from the work restblade, and means for receiving the work pieces from the work rest bladeand conveying them to a container.

17. In a' centerless grinder the combination of opposed grinding andregulating wheels forming a grinding throat between them, a work restblade within the grinding throat movable from*a position between theproximate portions of the operative faces of said wheels to a positionbetween the more distant portions of the operative faces ofvthe wheels,and means for supplying a work piece to the blade when in said positionbetween the more distant portions of the wheels.

18. In a centerless grinder the combination of opposed grinding andregulating wheels forminga grinding throat between them, a work restblade within the grinding throat movable from a position between theproximate portions of the operative faces of said wheels to a' positionbetween the more distant portions of the operative faces of the wheels,and means for laterally discharging work pieces from the work rest bladewhen it is in the position between the more distant portions of thewheels.

19. In a eenterlem grinder the combination of a pair of opposed grindingand regulating wheels forming a gr'nding throat between them, awork restblade within the throat, means for shifting the work rest blade, andmeans adjacent the work rest blade for receiving work pieces laterallydischarged from the work rest blade,

20. In a centerless grinder the combination of a pair of opposedgrinding and re lating wheels forming a grinding throat etween them, ashiftable work rest blade within the grinding throat, and a cam memberhaving portions thereon. for shifting the work rest blade and fordetermining the operative association of the work piece with the blade.

21. In' a centerless grinder the combination of a bed, a grinding wheelcarried-thereby and rotatable at a high grinding rate of speed, aregulating wheel carried by the bed in opposition to the grinding wheeland rotatable at a relatively slow work controlling rate of speed, thegrinding and regulating wheels having their proximate portions spacedfrom one another to form a grinding throat, a work rest blade within thegrinding throat and adapted to support a plurality of work pieces, andmeans associated with the work rest for maintaining the said work piecesin spaced relation and for holding same against axial movement relativeto the active faces of the wheels while the work pieces are beingsimultaneously acted upon by the said wheels.

22. In a centerless grinder the combination of a bed, a pair ofopposedgrinding and regulating wheels carried thereby and forming agrinding throat therebetween, and a work rest blade subtending thegrinding throat and having a plurality of work receiving pockets formedtherein, each pocket con-. forming substantially to the contour of thework piece and the'work rest blade presenting the plurality of workpieces simultaneously to the action of the grlnding and regulatingwheels.

23. In a centerless grinder the combination of a bed, a pair of opposedgrinding and regulating wheels carried thereby and form- .ing a grindingthroat therebetween, and a work rest blade subtending the grindingthroat and having a plurality of work receiving pockets formed therein,each pocket conforming substantially to the contour of the work pieceand the work rest blade presenting the plurality of work piecessimultaneously to the action of the grinding and regulating wheels, eachof said pockets in the work rest blade having an upstanding lug at oneend thereof, and adjustable means extending through each lug forengagement with a terminal portion of the work within the pocket toposition each work piece relative to its supporting pocket.

24. In a centerless grinder the combination of a bed, a pair of opposedgrinding and regulating wheels carried thereby and forming a grindingthroat therebetween, and a work rest blade subtending the grindingthroat and having a plurality of work receiving pockets formed therein,each pocket conforming substantially to the contour of the work pieceand the work rest blade presenting the plurality of work piecessimultaneously to the action of the grinding and regulating wheels, eachof said pockets in the work rest blade having an upstanding lug at oneend thereof, adjustable means extending through each lug for engagementwith a terminal portion of the work within the pocket to position eachwork piece relative to its supporting pocket, and means for locking thepositioning means relative to the lug.

25. In a centerless grinder the combination of a bed, a grinding wheelcarried thereby and rotatable at a high grinding rate of speed, a workrest blade carried by the bed adjacent the active face of the grindingwheel and adapted to support a plurality of work pieces, meansassociated with the work rest for maintaining the said work pieces inspaced relation and for holding same against axial movement relative tothe active faces of the wheels while the work pieces are beingsimultaneously acted upon by the said wheels, and a regulating wheelcarried by the bed in opposition to the grinding wheel rotatable at arelatively slow" work rotation controlling speed and having a pluralityof work engaging portions, one for each work piece carried by the workrest.

26. In a centerless grinder the combination of a bed, a pair of opposedgrinding and regulating wheels carried thereby and forming a grindingthroat therebetween, a work rest blade within the grindingthroat havinga plurality of work receiving pockets formed therein, the work restblade being adapted to present a plurality of workpieces to the actionof the grinding and regulating wheels, and a hopper mechanism carried bythe bed having a plurality of work holding passages therein each inalignment with one of the pockets in the work rest blade wherebsuccessive work pieces are fed into the wor receiving pockets of thesaid work rest blade. 27. In a centerless grinder the combination of abed, a pair of opposed grinding and regulating wheels carried therebyand forming a grinding throat therebetween, a work carrying andpositioning member within said grinding throat, means for shifting thework carrier and positioning member 'from a position adjacent theproximate portions of said wheels to a position between a more distantportion thereof, and means operable during the upward movement of thework carrying and positioning member, for laterally discharging the workfrom the member and placing additional work pieces thereon.

In testimony whereof I aflixmy signature.

CLEMENT BOOTH.

